48 cKnTn.K. 



varied. — C. Apella, C. elegans, C. capucinus, C. ceanthocepha- 

 his, C. albifrous, G. Jlavescens, C. rolmstus, C. annelhtus, C. 

 chrysopus, 0. subcristatus, C. capillatus. 



I. Hair of the crown bent back, round the face reflexed, forming 



a short crest over each eyebrow. No. 1. 



II. Hairs of the crown short, bent back ; those on the sides of the 



dark spot often elongated, forming two more or less erect 

 crests or tufts. Nos. 2, 3, 4, 5. 



III. Hair of the crown short, reflexed, not forming any crest. 

 Nos. 6-11. 



IV. Hair of the crown erect, elongate, forming a more or less 

 high central crest. Nos. 12, 13. 



V. Hair of the crown radiating from a centre, bent forward in 



front, and forming a superciliary crest. Nos. 14, 15. 



VI. Hair of the crown elongate, diverging in all directions, form- 

 ing a cap. No. 16. 



I. Hair of the head rather elongate, reflexed ; round the face reflexed, longer, 



forming a short crest over each egebroiv ; of cheek short, adpressed. 

 Toes rather elongate. 



1. Cebus leucogenys. The White-clieelced Cebus. 



Blackish ; hair soft, elongate, silky, with thick underfill', of head 

 shorter, of circumference of the face reflexed ; cheek and temples 

 yellow. 



Cebus leucogenys, Gray, P. Z. S. 1865, t. ! 

 Hub. Brazil. 



See C. cucullatus, Spix, Bras. t. 6, which seems to have a head 

 somewhat like this species ; but it is yellow, with a brown 

 hood. I have not seen any like it. 



II. Hairs of the croivn short, reflexed ; those on the sides of the dark patch 



often elongated, elevated, forming tiuomore or less elevated crests. 



2. Cebus Apella. The Apella. 



Fur thick, rather harsh, reddish brown, darker on the middle of 

 the back, tail, and legs ; forearms, crown -spot, and whiskers black 

 or blackish ; front of the shoulders paler or yellow ; tbo crown- 

 spot broad, often produced on the sides into more or less thick 

 elongated longitudinal crests. 



Sapajou brun, Buffon, xv. t. 4, p. 37. S. cornu, Buff on, Sitpp. vii. 

 Simia Apella, Linn, (younger). Cebus Apella, I. Geoff. (Var., 

 horned) Cebus fatuellus, Geoff. C.macrocephalus, Spix, Bras. t. 1 

 (no crests). 



Var. Fur pale yellowish ; whiskers yelloAV. B. M. 



JIab. Brazil. A very variable species. 



